Computer Science for IGCSE & O level - Boolean Logic (Section 4)
1
If the input to a NOT gate is 0, what is the output?
Хариулт
(B)
1
2
Which type of gate produces an output of 1 when the inputs are different?
Хариулт
(A)
XOR gate
3
In digital logic, what is the purpose of a 'buffer'?
Хариулт
B
C
4
What is the purpose of using intermediate values within a truth table, as seen in the provided examples?
Хариулт
(B)
To break down a complex expression into manageable parts.
5
What is the output of a two-input NOR gate when both inputs are 0?
Хариулт
(B)
1
6
What does the term 'logic circuit' refer to?
Хариулт
(B)
A circuit composed of logic gates
7
What type of circuits are logic gates primarily used in?
Хариулт
(C)
Electronic circuits
8
What is the result of the Boolean expression NOT (1 AND 0)?
Хариулт
(B)
1
9
What is a primary reason for creating a truth table when designing logic circuits?
Хариулт
(B)
To visually display the input and output relationships.
10
In the context of logic circuits, what is the purpose of a 'logic expression'?
Хариулт
(C)
To represent the functionality of a logic circuit using mathematical notation.
11
Which logic gate produces an output that is the inverse of an AND gate?
Хариулт
(B)
NAND
12
What is the function of the NOT gate?
Хариулт
(A)
Inverts the input signal
13
Which of the following is a key component in the example of designing a logic circuit for a wood system?
Хариулт
(B)
Analyzing the real-world parameters.
14
What will be the output of a full-adder if the inputs are: A=1, B=1, and Cin=1?
Хариулт
(A)
Sum=1, Cout=1
15
What does the symbol NOT represent in the examples?
Хариулт
(A)
A inverting function
16
What is the output of a NAND gate if input A is 1 and input B is 1?
Хариулт
(A)
0
17
What is the value of 'A' in Boolean algebra if A = 0?
Хариулт
(B)
0
18
Which logic gates are combined to make the final logic circuit shown in the example?
Хариулт
(D)
NOT, AND, and OR
19
What is the output of the logic gate NOT (A) if A=1?
Хариулт
(A)
0
20
What is the purpose of the truth table?
Хариулт
(A)
To represent all the possible input and output combinations of a logic circuit.
21
What does the Karnaugh map primarily help with in digital logic?
Хариулт
(A)
Simplifying Boolean expressions
22
What is the output of a 2-input OR gate when both inputs are 1?
Хариулт
(B)
1
23
What is the simplest form of the expression A + AB?
Хариулт
(A)
A
24
If A=0, and B=0, what will be the output of an AND gate?
Хариулт
(A)
0
25
How are the intermediate logic circuits connected to produce the final output?
Хариулт
(D)
Dependent on the specific logic expression.
26
If an input A is connected to two NOT gates in series, what is the resulting output signal?
Хариулт
(A)
A
27
Which of the following statements about the half-adder circuit is correct?
Хариулт
(D)
All of the above.
28
What is the output of a two-input AND gate if the inputs are 0 and 1?
Хариулт
(A)
0
29
In a half adder, if A=1 and B=0, what will the Sum be?
Хариулт
(B)
1
30
How many possible input combinations does a 2-input logic gate have?
Хариулт
(D)
4
31
Based on the examples, what type of values represent the output of a logic circuit?
Хариулт
(B)
Only 0 and 1.
32
The output of a NOR gate is HIGH (1) if:
Хариулт
(D)
None of the inputs are HIGH
33
In the example of the engine management system, what would the output (Y) be if motor speed = 4000rpm, bearing temp = 70C and water velocity = 3 m/s?
Хариулт
(A)
1
34
What is the purpose of a half adder circuit?
Хариулт
(C)
To add two single-bit binary numbers.
35
In Boolean algebra, what does the 'plus' symbol (+) represent?
Хариулт
(B)
OR operation
36
In the manufacturing system for plastic pipes, the system will sound an alarm (X), if the temperature is >= 250 degrees Celsius AND the pressure is at 5 bar. If temperature is 250 and the pressure is at 4, what will be the state of X?
Хариулт
(B)
0
37
Which gate's output is '1' if at least one input is '1'?
Хариулт
(B)
OR
38
In Boolean algebra, what logical operation does the plus sign (+) represent?
Хариулт
(B)
OR
39
What is the output of an OR gate with inputs A=0 and B=1?
Хариулт
(B)
1
40
Which gate will produce the output 1 if input A=0 and input B=0?
Хариулт
(A)
NAND gate
41
What is the purpose of logic gates in digital circuits?
Хариулт
A
C
42
In the wood system example, what do the different 'conditions' refer to?
Хариулт
(B)
Input parameters or thresholds.
43
What is the role of an AND gate in the examples?
Хариулт
(A)
It outputs 1 only if all inputs are 1.
44
What is the binary equivalent of decimal number 3?
Хариулт
(D)
11
45
What is the result of 'A OR A' in Boolean algebra?
Хариулт
(C)
A
46
What is the function of a truth table in digital logic?
Хариулт
(C)
To show the relationship between the inputs and the outputs
47
What is the simplified form of A.A in Boolean algebra?
Хариулт
(A)
A
48
What is the output of a two-input AND gate when the inputs are A=1 and B=1?
Хариулт
(B)
1
49
How many possible states can a single bit represent?
